Mites (excluding chiggers) of mammals of Oregon

New information on the ectoparasitic mites of the following species of mammals from Oregon is presented: (1) pika — Ochotona ; (2) squirrels — Eutamias, Spermophilus, Tamiasciurus; (3) grasshopper mouse — Onychomys; (4) woodrats — Neotoma; (5) muskrat — Ondatra; (6) jumping mice — Zapus; and (7) weasels — Mustela, Spilogale. New records of species for the state and new host records are also given. Finally, a cross - referenced list of all known mites of wild mammals from Oregon is presented.      

First Pleistocene jumping mouse ( Zapus , Zapodinae, Rodentia) from Utah

Two of the Little Dell Dam fossil localities produced the 1st Pleistocene records of the jumping mouse Zapus from Utah. We describe these teeth in detail and compare their morphology with both extinct and extant jumping mouse taxa. Although it is not possible to confidently assign these specimens to a particular species, the Little Dell Dam fossils are clearly distinct from the only living jumping mouse ( Zapus princeps ) currently known from Utah. The paracone is attached to the rest of the occlusal surface of the upper 1st and 2nd molars in modern Z. princeps from Utah; the paracone is isolated in the molars from Little Dell Dam. The fossils from Little Dell Dam are the 1st reported records of Pleistocene Zapus west of the Rocky Mountains.     

Plague in pine martens and the fleas associated with its occurrence

Thirteen pine martens ( Martes Americana ) were sampled periodically from July 1979 to September 1980 for plague ( Yersinia pestis ) antibodies and their fleas collected and identified. Four individuals were positive for plague antibodies on 8 of 24 sampling occasions. Titer peaks in these individuals occurred simultaneously in early winter but fell to undetectable levels by late spring. A chipmunk flea ( Monopsyllus ciliatus ) was the most common ectoparasite constituting 55% of all individuals collected. Thirty-one percent of all fleas belonged to Chaetopsylla floridensis, a species previously unreported in California. The remains of ground-dwelling sciurids (chipmunks, Eutamias spp., and ground squirrels, Spermophilus spp.) were very common in marten scats during the period preceding elevated titers. For this reason, and the fact that 92% of all fleas collected from martens during this same period were found more commonly on chipmunks and ground squirrels, these rodents were implicated as the source of the martens’ exposure to plague.     

Genetic variation and population structure in the cliff chipmunk, Eutamias dorsalis , in the Great Basin of western Utah

Allelic variation at 21 of 39 electrophoretically resolved enzyme loci was used to examine patterns of geographic differentiation and population structure in six allopatric samples of Eutamias dorsalis . Coefficients of genetic similarity for paired combinations of E. dorsalis samples ranged from 0.955 to 0.975, except for one population that was 0.900. Conservative genic divergence among five populations is proposed to be the result of relatively recent isolation events. High positive F 18 values and chi– square analyses confirm a significant excess of homozygotes at several loci at the five localities for which sample sizes were statistically adequate. This may be partly attributable to inbreeding, a Wahlund effect, linkage disequilibrium, posttranslational modification, or some combination of these; but at present some of these alternatives cannot be excluded in favor of a single explanation. Some samples were collected across altitudinal gradients of over 800 m, suggesting that a Wahlund effect may be the most likely explanation for low levels of heterozygosity in these populations.     

Home range of the western jumping mouse, Zapus princeps, in the Colorado Rocky Mountains

Western jumping mice, Zapus princeps, were live - trapped during the summer of 1975 in an aspen forest in the Front Range of the Colorado Rocky Mountains. Home range sizes were calculated using the exclusive boundary strip method, and it was discovered that males had larger home ranges (298 – 3315 m 2 , x = 1743 m 2 ) than females (680 – 1275 m 2 , x = 1041 m 2 ). Mean range length was 96.5 m for males and 78.5 m for females. Spatial relationships showed that females tended to be more territorial than males, based on the females' higher percentage of exclusive home ranges, greater distance between centers of activity, and more uniform spacing.     

Vegetative and edaphic factors affecting abundance and distribution of small mammals in southeast Oregon

The relationships between vegetative and edaphic habitat factors and the local distribution and abundance of small mammals on Malheur National Wildlife Refuge, Harney County, Oregon, were examined between July 1973 and June 1975. Of 16 species of small mammals captured, deer mice ( Peromyscus maniculatus ), montane voles ( Microtus montanus ), Great Basin pocket mice ( Perognathus parvus ), and least chipmunks ( Eutamias minimus ) comprised 90.1 percent of the individuals. The physiognomy of the vegetation was a factor in the distribution of rodent species other than deer mice. Pocket mice and chipmunks were restricted to the communities dominated by sagebrush ( Artemisia tridentata ) or greasewood ( Sarcobatus vermiculatus ). Population densities of pocket mice and chipmunks were significantly related to edaphic factors such as soil depth, texture, and strength, which may have affected the construction and stability of burrows. Montane voles occurred only in marsh or grassland communities. Population densities of voles were directly correlated with the amount of cover and inversely correlated with its patchiness. Deer mice were the most common species encountered and occurred in all but the grassland communities. The density of this species was related to vegetative or edaphic factors only seasonally or in certain habitats, and few generalizations could be made.     

Summer food habits of a small mammal community in the pinyon-juniper ecosystem

Summer food habits of a small mammal community in the Piceance Basin of Colorado were investigated during 1977 and 1978 using a combination of fecal and stomach content analyses. Three species, deer mice ( Peromyscus maniculatus ), least chipmunks ( Eutamias minimus ), and plains pocket mice ( Perognathus flavescens ) consumed arthropods as the majority of their diets. Bushy-tailed woodrats ( Neotoma cinerea ) consumed predominantly woody vegetation, and the diet of golden-mantled ground squirrels ( Spermophilus lateralis ) consisted primarily of forbs and fungi. Mountain cottontails ( Sylvilagus nuttalli ) depended heavily on grasses, with a mix of woody vegetation and forbs composing the remainder of their diet. Most of the species investigated selected different foods and thus avoided competition for food. Plains pocket mice may have competed with deer mice for arthropods in 1977.     

Influence of experimental habitat manipulations on a desert rodent population in southern Utah

This paper addresses how habitat manipulations in a black sagebrush ( Artemisia nova ) -dominated area, John's Valley of southern Utah, affected resident desert rodent populations. Rodents studied included the deer mouse ( Peromyscus maniculatus ), Great Basin pocket mouse ( Perognathus parvus ), sagebrush vole ( Lagurus curtatus ), Ord's kangaroo rat ( Dipodomys ordii ), and least chipmunk ( Eutamias minimus ). The experimental design involved analyses of treatment and control (nontreatment) plots rather than pre- and posttreatment of all plots. Habitat manipulations emphasized cutting of shrubs (rotobeating), treatment of plants with a herbicide (2,4-D), and reseeding with a mixture of grasses, forbs, and shrubs. Posttreatment trapping indicated the deer mouse was the most abundant rodent in treatment and control plots. Data indicate the prescribed habitat treatments had no significant negative affects on the deer mouse demes on the control or treatment plots. Habitat treatments may have negatively impacted recruitment in pocket mice. Least chipmunks were not captured in plots treated by rotobeating. Our habitat manipulations may have contributed to interspecific competition in this rodent community through the reduction of both food and cover.     

New synonymy and new species of American bark beetles (Coleoptera: Scolytidae), part XI

The following new generic synonymy is proposed: Coptodryas Hopkins (= Microperus Wood), Cyrtogenius Strohmeyer (= Carpophloeus Schedl, Taphroborus Nunberg), Glostatus Schedl (= Ctonocryphus Schedl, Rhopalocryphus Nunberg), Hylurgops LeConte (= Hylescerites Schedl), Hypothenemus Westwood (= Ernophloeus Nunberg), Monarthrum Kirsch (= Eupteroxylon Eggers), Terminalinus Hopkins (= Kelantanius Nunberg), Xylechinus Chapuis (= Pruniphagus Murayama), Xylocleptes Ferrari (= Hylonius Nunberg). New combinations include: Pityophthorus anticus Schedl is transferred to Araptus; Hylesinus machilus Schedl is transferred to Phloeosinus; Phloeophthorus acaciae Lea is transferred to Phloeotribus; Blastophagus squamosus Schedl is transferred to Polygraphus; Chramesus semibrunneus Eggers is transferred to Pseudochramesus; Dacryophthorus capensis Schedl is transferred to Xylechinus; Pseudochramesus imperialis Schedl is transferred to Xylechinus ; and Hoplitontus abyssinicus Schedl is transferred to Xylocleptes . New specific synonymy includes: Hypothenemus sundaensis (Eggers) (= Ernophloeus costalimai Nunberg). A note on the South American Hylesinus antipodius Schedl is included. New names are proposed as follows: Hylesinopsis kenyae for africanus (Schedl 1963) (from Alniphagus ) and Hylesinopsis ugandae for africanus (Schedl 1965) (from Hylesinus ). Species described as new to science include: Ambrosiodmus ferns (Mexico), Ambrosiodomus paucus (Costa Rica), Carphoborus bicornis (USA), Chaetophloeus pouteriae (Mexico), Cnemonyx euphorbiae (Mexico), Corthylus convexifrons (Venezuela), Corthylus senticosus (Mexico), Corthylus sentosus (Mexico), Cryptocarenus pubescens (Brazil), Cryptocarenus spatulatus (Mexico), Dendrocranulus mexicanus (Mexico), Hylesinus caseariae (Mexico), Pityophthorus levis (USA), and Trischidias exigua (Mexico).     

Nomenclatural changes and new species in Platypodidae and Scolyidae (Coleoptera), Part II

In Platypodidae the new name Genyocerus strohmeyeri replaced the junior homonym G. albipennis Strohmeyer, 1942, and the new name Platypus applanatulus replaced the junior homonym Platypus applanatus Schedl, 1976. New names are presented in Scolytidae as replacements for junior homonyms as follows: Cryphalus brownei for Cryphalus artocarpus Schedl, 1958; Cyclorhipidion dihingicum for Xyleborus dihingensis Schedl, 1951; Hypothenemus aterrimulus for Lepiceroides (now Hypothenemus ) aterrimus Schedl, 1957; Hypothenemus krivolutskayae for Hypothenemus insularis Krivolutskaya; Pityophthorus africanulus for Neodryocoetes (now Pityophthorus ) africanus Schedl, 1962; Scolytogenes papuensis for Xylocryptus (now Scolytogenes ) papuanus Schedl, 1975; Scolytogenes paradoxus for Scolytogenes papuanus Schedl, 1979; Xyleborinus spiniposticus for Eidophelus (now Xyleborinus ) spinipennis Schedl, 1979; Xyleborus formosae for Xyleborus formosanus Browne, 1981. New combinations for fossil Scolytidae include Dryocoetes diluvialis for Pityophthoroidea diluvialis Wickham, 1916, and Hylesinus hydropicus for Apidocephalus hydropicus Wickham, 1916. Phloeotribus zimmermanni Wickham, 1916, is transferred to the family Curculionidae. In Scolytidae, Cryphalophilus Schedl, 1970, is a junior generic synonym of Scolytogenes Eichhoff; Macrocryphalus Nobuchi, 1981, is a junior generic synonym of Hypothenemus Westwood, 1836; Nipponopolygraphus Nobuchi, 1981, is a junior generic synonym of Polygraphus Erichson, 1836; Pseudocosmoderes Nobuchi, 1981, is a junior generic synonym of Cosmoderes Eichhoff, 1878; Taphrocoetes Pfeffer, 1987, is a junior generic synonym of Taphrorychus Eichhoff; Trypanophellos Bright, 1982, is a junior generic synonym of Liparthrum Wollaston. New specific synonymy in Scolytidae includes: Brachyspartus moritzi Ferrari (= Corthylus obtusus Schedl), Carphoborus minimus (Fabricius) (= Carphobhorus balgensis Murayama), Coccotrypes dactyliperda (Fabricius) (= Coccotrypes tropicus Eichhoff), Cryphalus scabricollis Eichhoff (= Cryphalus brevicollis Schedl), Ficicis despects (Walker) (= Hylesinus samoanus Schedl), Hylastes plumbeus Blandford (= Hylurgops fushunensis Murayama), Hylurgops interstitialis (Chapuis) (= Hylurgops niponicus Murayama), Hylurgops spessivtsevi Eggers (= Hylurgops modestus Murayama), Ips stebbingi Strohmeyer (= Ips schmutzenhoferi Holzschuh), Phloeosinus rudis Blandford (= Phloeosinus shotoensis Murayama, Polygraphus kaimochi (Nobuchi) (= Polygraphus querci Wood), Polygraphus proximus Blandford (= Polygraphus magnus Murayama), Scolytogenes braderi Browne (= Scolytogenes orientalis Schedl), Scolytoplatypus parvus Sampson (= Scolytoplatypus ruficauda Eggers), Sphaerotrypes querci Stebbing (= Chramesus globulus Stebbing, Sphaerotrypes tectus Beeson), Sueus niisimai (Eggers) (= Sphaerotrypes controversae Murayama), Tomicus brevipilosus (Eggers) (= Blastophagus khasianus Murayama, Blastophagus multisetosus Murayama). The European Hylastes opacus Erichson is reported as an established breeding population in New York (USA). Phloeosinus armatus Reitter of Asia Minor is reported as causing economic damage as a new introduction to Los Angeles County, California. The following species are named as new to science: Cyclorhipidion subagnatum (Philippine Islands), Dendrotrupes zealandicus (New Zealand), Polygraphus thitsi (Burma), Triotemnus pilicornis (India), and Xyleborus mangificus (Peru).     

Nomenclatural changes in Scolytidae and Platypodidae (Coleoptera)

New synonymy in Scolytidae includes Cryphalus piceae (Ratzeburg, 1837) (= Cryphalus subdepressus Eggers, 1940), Gnathotrupes longiusculus (Schedl, 1951) (= Gnathotrupes ciliatus Schedl, 1975), Hypothenemus eruditus Westwood (= Stephanoderes communis Schaufuss, 1891). In Platypodidae the new name Platypus abruptifer is proposed as a replacement for the junior homonym Platypus abruptus Browne, 1986; type-species designations are proposed for the genus group names Scutopygus Nunberg, 1966, Pygodolius Nunberg, 1966, Mixopygus Nunberg, 1966, Mesopygus Nunberg, 1966, Asetus Nunberg, 1958, Stenoplatypus Strohmeyer, 1914, Platypinus Schedl, 1939, Platyscapus Schedl, 1939, Treptoplatypus Schedl, 1939, Tesseroplatypus Schedl, 1935; previously unpublished specific synonymy is presented for Crossotarsus externedentatus (Fairmaire, 1849) (= Diapus talurae Stebbing, 1906), Crossotarsus terminatus Chapuis, 1865 (= Crossotarsus nicobaricus Beeson, 1937), Platypus abditus Schedl, 1936 (= Platypus transitus Schedl, 1978), Platypus rugosifrons Schedl, 1933 (= Platypus pretiosus Schedl, 1961), Platypus tiriosensis Reichardt, 1965 (= Platypus schedli Wood, 1966), Treptoplatypus multiporus Schedl, 1968 (= Playtpus fastuosus Schedl, 1969).     

The Old World genera of braconine wasps (Hymenoptera: Braconidae)

An illustrated key is provided to the Old World genera of Braconinae. In addition, notes are provided on each genus and on a number of characters employed in the key. One new tribe and five new genera based on two existing and three new species are described. The new taxa are as follows: Angustibracon gen. nov. from India (type-species: Bracon leptogaster Cameron, 1899), Bathyaulacini tribus nov. (type-genus: Bathyaulax Szépligeti, 1906), Cassidibracon gen. nov. from West Africa (type-species: Cassidibracon castus sp. nov.), Serraulax gen. nov. from the Afrotropical Region (type-species: Iphiaulax lukombensis Cameron, 1912), Virgulibracon gen. nov. from Australia (type-species: Virgulibracon vulsus sp. nov.) and Vomeribracon gen. nov. from New Guinea (type-species: Vomeribracon amplipenniger sp. nov.). The Pseudodicrogeniini Achterberg, 1976 is synonymized with the Euurobraconini Ashmead, 1900. Ten new generic synonymies are reported: Atanycolimorpha Viereck, 1913 (= Cyanopterus Haliday, 1835), Caenoprymnus Cameron, 1909 (= Soter Saussure, (1890) 1892), Coelodontus Roman, 1912 (= Trigastrotheca Cameron, 1906), Cynodobracon Cameron, 1912 (= Nedinoschiza Cameron, 1911), Iphioilta Ramakrishna Ayyar, 1928 (= Chaoilta Cameron, 1899), Kenema van Achterberg, 1983 (= Trigastrotheca Cameron, 1906), Odontopygia Enderlein, (1918) 1920 (= Trigastrotheca Cameron, 1906), Paraspinaria Cameron, 1905 (= Mesobracon Szépligeti, 1902), Pseudoglyptomorpha Tobias, 1957 (= Pseudovipio Szépligeti, 1896) and Glyptomorpha (Remorpha) Shestakov, 1932 (Pseudovipio Szépligeti, 1896).     

Rodent populations, biomass, and community relationships in Artemisia tridentata, Rush Valley, Utah

Three desert Artemisia tridentata communities in Rush Valley, Utah, were trapped for small rodents during the summer of 1970, and population densities were estimated for each population category using Lincoln's index. Animals were weighed and rodent biomass calculated by species throughout the summer. Population, biomass, and other data were then analyzed to gain an understanding of the community relationships of the three study areas to each other as well as to the A. tridentata community types of the Great Basin. Peromyscus maniculatus, Eutamias minimus, and Reithrodontomys megalotis were common to area 1, whereas P. maniculatus, E. minimus, and Perognathus parvus were common to areas 2 and 3. The peak estimated standing crops were 182.8 (74.0). 143.1 (57.9), and 129.7 g/acre (52.5 g/ha) for areas 2, 1, and 3 respectively. The population and biomass of area 2 peaked in midsummer, area 1 early summer, and area 3 late summer.     

New synonymy and new species of American bark beetles (Coleoptera: Scolytidae), Part III

New synonomy is proposed as follows: Metacorthylus Blandford (= Paracorthylus Wood), Corthylus spinifer Schwarz (= Corthylus tomentosus Schedl), Cryptocarinus brevicollis Eggers ( = Cryptocarenus coronatus Wood), Dendrocranulus guatemalensis (Hopkins), n. comb. (= Dendrocranulus parallelus Schedl), Dendroterus mexicanus Blandford (= Conophthocranulus umbratus Schedl), Hypothenemus cylindricus (Hopkins) (= Hypothenemus guadeloupensis Schedl), Hypothenemus erectus LeConte (= Stephanoderes discedens Schedl), Hypothenemus javanus (Eggers) (= Stephanoderes pistor Schedl, Stephanoderes prosper Schedl), Xyleborus pseudotenuis Schedl (= Xyleborus tenuis Schedl), and Xyleborus villosulus Blandford (= Xyleborus coccotrypoides Eggers, villosus Schedl). Scolytodes punctiferus n. n. is proposed for Scolytodes punctifer Wood, 1971 (nec Wood 1969). The following species are named as new to science: Amphicranus argutus, A. fulgidus, A. micans, Pityophthorus inops, P. debilis, P. strictus. P. galeritus. P. sobrinus, P. laetus, P. lenis, P. conspectus P. medialis (Costa Rica), P. perexiguus (Costa Rica and Panama), P. scitulus (Panama), P. costatulus, P. costabilis, P. detentus, P. nebulosus, P. melanurus, P. indigens, P. burserae, P. molestus, P. diligens, P. corruptus (Mexico), P. tenax, P. nugalis, P. minutalis (Guatemala), P. nemoralis, P. morosus, P. hermosus (Honduras), Araptus gracilens (Mexico).     

The Indo-Australian and E. Palaearctic braconine wasp genus Euurobracon (Hymenoptera: Braconidae)

An illustrated key to the females of Euurobracon is provided. Three new species and two new subspecies are described: E. interstitialis sp. nov. from Malaysia; E. denticephalus sp. nov. from Dutch New Guinea; E. latitempus sp. nov. from New Guinea; E. cephalotes sumatranus ssp. nov. from Sumatra; impossibilis curticaudis ssp. nov. from Papua New Guinea. E. quadriceps var. apicalis Roman is raised to specific status. The following new synonyms are proposed: Euurobracon maculipennis (Cameron, 1910) (= E. triplagiata (Cameron, 1900)); E. melanospilus (Cameron, 1910) (= E. yokahamae (Dalla Torre, 1898)); E. merinotoides (Enderlein, 1920) (= E. forticornis (Cameron, 1905)); E. montivagus (Cameron, 1910) (= E. cephalotes cephalotes (Smith, 1858); stat. nov.); Collastes nigropectus (Cameron, 1911) (= E. yokahamae (Dalla Torre, 1898)). Two species are excluded from Euurobracon for the first time: E. nitidulus Brues, 1922 and E. mandibularis Brues, 1924. Each species of Euurobracon is fully described.     

On systematic relations of Oomorphus concolor (Sturm) Col., Chrysomelidae), with descriptions of its larva and of an aberrant Cryptocephaline larva from Australia

The phylogenetic significance of morphological characters used to diagnose Bactericera, Rhinopsylla, Paratrioza, Allotrioza, Klimaszewskiella, Eubactericera, Phylloplecta and Sinitrioza is examined. There is no evidence that the genera or subgenera, in any of their present or past definitions, constitute natural units. The six former together, however, form a monophyletic group, defined by a combination of adult, larval and egg characters. Phylloplecta and Sinitrioza, which share similar adult characters with Bactericera, differ in the larval and egg morphology. The following new synonymies are established: Bactericera (=Rhinopsylla pro parte, = Paratrioza, = Allotrioza, = Klimaszewskiella, = Eubactericera pro parte) and Phylloplecta (= Sinitrioza). A list of the 121 species included in Bacerticera is provided and 75 new combinations are introduced (60 in Bactericera, 4 in Phylloplecta, 9 in Trioza and 1 in Kuwayama). Bactericera equisetifolii sp. n. and B. vellae sp. n. are described from Israel and Spain respectively, and B. loginovae, B. perrisii and B. rossica are redescribed. The following new species level synonymies are proposed: B. perrisii (= B. maritima) and B. gobica (= P. sinica, = P turcamanica). Variation of genal cone length in B. kratochvili is discussed and the presence of two biological races is noted in B. modesta. Keys are provided for the adults of the European species associated with Salix, and the last instar larvae of the West palaerctic species; the latter are also illustrated. Information on life cycles and host plants is summarised and briefly discussed. Differences in the hindwing venation, which were recently used to erect the families Rhinopsyllidae and Rhinocolidae are shown to be trivial. The two families are therefore synonymised with the Triozidae and Psyllidae respectively.     

Species of the genera Bakera and Mangganeura (Homoptera: Auchenorrhyncha: Typhlocybinae) occurring on mango and other crop plants in the Oriental region

The genera Bakera (Bakera), Bakera (Guinobata) and Mangganeura (Homoptera: Auchenorrhyncha: Typhlocybinae) are re-described and compared. Sandalla is considered a synonym of Bakera (Guinobata) (syn. nov.).

Bakera (Bakera) nigrobilineata (Melichar) (=vittata Mahmood) is redescribed and illustrated from mango in the Philippines, on which it is frequently abundant, and found in association with Bakera (Bakera) luzonica sp. nov. which is described. Bakera (Bakera) abaca sp. nov. is described from the Philippines having been collected on abaca (Manila hemp). Bakera (Guinobata) nigroscuta Mahmood is redescribed from the Philippines and its association with coconut confirmed. Mangganeura reticulata Ghauri, described from Malaysia on mango, has been found in Thailand and the hitherto unknown female is described.     

Pre-ovipositional and ovipositional behaviour of Trichouropoda ovalis (C.L. Koch) and Uroobovella marginata (C.L. Koch) (Parasitiformes: Uropodina: Trematuridae,Urodinychidae) with notes on egg incubation and hatching behaviour

Egg deposition by the soil mites Trichouropoda (= Oodinychus) ovalis (C.L. Koch and Uroobovella (= Fuscuropoda) marginata (C.L. Koch), egg incubation and hatching behaviour were observed using continuous video-monitoring. The oviposition in both species was found to consist of three distinct phases. In Phase 1, both species engage in pre-ovipositional activity prior to the egg being extruded from the genital opening. Phase 1 lasted approximately 7.5 minutes in T. ovalis and about 6 minutes in U. marginata. Phase 2 involved egg deposition and lasted approximately 2.5 times longer in T. ovalis (88 seconds) than in U. marginata. Egg covering occurs in Phase 3, and in both species lasts about 25 minutes. Incubation time in U. marginata (137 hours) was approximately 30% shorter compared to that of T. ovalis, while the hatching time was 2 times longer (150 min) in the latter species.     

A redescription of Diphyllobothrium stemmacephalum Cobbold, 1858 with comments on other marine species of Diphyllobothrium Cobbold, 1858

Diphyllobothrium stemmacephalum, the type-species of the genus Diphyllobothrium, is redescribed based on specimens found in Phocaena phocaena (L.) caught off Denmark and the Netherlands as well as specimens from the County Museum (Liverpool) from the type-locality. In addition, some other Diphyllobothrium species from marine mammals, D. cordatum, D. lanceolatum, D. hians, D. cameroni, D. elegans, D. lashleyi, D. wilsoni, D. rauschi sp. nov. (= syn. D. hians sensu Rausch, 1969) and D. minutus sp. nov. (= syn. D. elegans sensu Rausch, 1969), are briefly redescribed. In conclusion, a systematic grouping of the species is tried.