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Nasopharyngeal mites Halarachne halichoeri (Allman, 1847) parasitizing the gray seal Halichoerus grypus (Fabricius, 1791) in the Baltic Sea with notes on other parasitic Halarachnidae associated with marine mammals


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Figure 1

Halarachne halichoeri. A: female (dorsal view), B: female (ventral view), C: larva
Halarachne halichoeri. A: female (dorsal view), B: female (ventral view), C: larva

Checklist of mites from the family Halarachnidae associated with marine mammals. (Based on Banks 1899, 1910; Ferris 1925; Oudemans 1925; Doetschman 1944; Popp 1961; Domrow 1962, 1974; Wilson 1970; Dailey & Brownell 1972; Margolis & Dailey 1972; Dunlap et al. 1976; Furman 1977; Furman & Dailey 1980; Kim et al. 1980; Fay & Furman 1982; Webb et al. 1985; Gomez-Puerta & Gonzales-Viera 2015; Alonso-Farré et al. 2012; Felix 2013 and Gastal et al. 2016; data verified with the current systematic status of the species)

Halarachnidae Host
Scientific name Common name Class, Order Family
Halarachne americana Banks, 1899 Monachus tropicalis (Gray, 1850) Caribbean monk seal Carnivora
Phocidae
Cystophora cristata (Erxleben, 1777) hooded seal
Enhydra lutris (Linnaeus, 1758) sea otter Mustelidae
Halarachne halichoeri (Allman, 1847) Halichoerus grypus (Fabricius, 1791) gray seal
Synonyms Mirounga leonina (Linnaeus, 1758) southern elephant seal Phocidae
Halarachne erratica Fain et Mortelmans, 1959 Phoca largha Pallas, 1811 spotted seal
Halarachne otariae Steding, 1923
Phoca vitulina Linnaeus, 1758 harbor seal
Halarachne taita Eichler, 1958
Pygoscelis papua (J. R. Forster, 1781)

accidental infection (see the comment in the text)

gentoo penguin Sphenisciformes Aves Spheniscidae
Zalophus californianus (Lesson, 1828)

Newell (1947) believes it was Halarachne miroungae

California sea lion Otariidae
Halarachne laysanae Furman et Dailey, 1980 Monachus schauinslandi Matschie, 1905 Hawaiian monk seal Phocidae
Enhydra lutris (Linnaeus, 1758) sea otter Mustelidae
Mirounga angustirostris (Gill, 1866) northern elephant seal
Halarachne miroungae Ferris, 1925
Mirounga leonina (Linnaeus, 1758) southern elephant seal Phocidae
Phoca vitulina Linnaeus, 1758 harbor seal
Arctocephalus australis (Zimmermann, 1783) South American fur seal
Arctocephalus pusillus (Schreber, 1775) Carnivora
(= Arctocephalus tasmanicus Scott et Lord, 1926) cape fur seal
(= Arctocephalus doriferus Wood Jones, 1925)
Arctocephalus tropicalis (J. Gray, 1872)

Banks (1910) does not specify the species, he only provides information such as “seal pup”. On the other hand, Oudemans (1925) reports that they might represent (Arctophora) elegans Peters (=? Arctocephalus forsteri (Lesson) or Macrorhinus leoninus (L.). However, it follows from Oudemans’ notes that there might be three species (Arctocephalus tropicalis, A. forsteri and M. leonina). The original record was used and this certainly applied to “Arctophoca” and not “Arctophora

or Arctocephalus forsteri (Lesson, 1828)

Banks (1910) does not specify the species, he only provides information such as “seal pup”. On the other hand, Oudemans (1925) reports that they might represent (Arctophora) elegans Peters (=? Arctocephalus forsteri (Lesson) or Macrorhinus leoninus (L.). However, it follows from Oudemans’ notes that there might be three species (Arctocephalus tropicalis, A. forsteri and M. leonina). The original record was used and this certainly applied to “Arctophoca” and not “Arctophora

Otariidae
Subantarctic fur seal or
(= Otaria (Arctophora) elegans Peters, 1876) Australasian fur seal
Orthohalarachne attenuata (Banks, 1910) (=? Arctocephalus forsteri (Lesson, 1828))
Synonyms Callorhinus ursinus (Linnaeus, 1758) northern fur seal
Halarachne attenuata Banks, 1910
Halarachne otariae Steding, 1923 Eumetopias jubatus (Schreber, 1776) Steller sea lion
Halarachne reflexa Tubb, 1937 Homo sapiens Linnaeus, 1758

accidental infection (see the comment in the text)

man Primates Hominidae
Halarachne zalophi Oudemans, 1916
Halarachne rosmari Oudemans, 1916 Mirounga angustirostris (Gill, 1866) northern elephant seal
Halarachne magellanica Finnegan, 1934 Mirounga leonina Linnaeus, 1758

Banks (1910) does not specify the species, he only provides information such as “seal pup”. On the other hand, Oudemans (1925) reports that they might represent (Arctophora) elegans Peters (=? Arctocephalus forsteri (Lesson) or Macrorhinus leoninus (L.). However, it follows from Oudemans’ notes that there might be three species (Arctocephalus tropicalis, A. forsteri and M. leonina). The original record was used and this certainly applied to “Arctophoca” and not “Arctophora

Phocidae
Orthohalarachne magellanica (Finnegan, 1934) southern elephant seal
Orthohalarachne reflexa (Tubb, 1937) (= Macrorhinus leoninus (Linnaeus, 1758))
Orthohalarachne rosmari (Oudemans, 1916) Neophoca cinerea (Péron, 1816) Australian sea lion Otariidae
Orthohalarachne zalophi (Oudemans, 1916) Odobenus rosmarus (Linnaeus, 1758) walrus Odobenidae
Otaria fl avescens (Shaw, 1800)
South American sea lion Otariidae
(= Otaria byronia (de Blainville, 1820))
Phoca vitulina Linnaeus, 1758 harbor seal Phocidae
Carnivora
Zalophus californianus (Lesson, 1828) California sea lion
Zalophus wollebaeki Sivertsen, 1953 Galapagos sea lion
Arctocephalus australis (Zimmermann, 1783) South American fur seal
Orthohalarachne diminuata (Doetschman
1944) Arctocephalus pusillus (Schreber, 1775) cape fur seal Otariidae
(= Arctocephalus doriferus Wood Jones, 1925)
Synonyms
Halarachne diminuata Doetschman, 1944 Callorhinus ursinus (Linnaeus, 1758) northern fur seal
Orthohalarachne chabaudi Gretillat,1960 Eumetopias jubatus (Schreber, 1776) Steller sea lion
Orthohalarachne letalis Popp, 1961 Zalophus californianus (Lesson, 1828) California sea lion

Body size (means, ranges, SD; micrometers) of Halarachne halichoeri

Morphological features Present study Oudemans (1925)

the author provides only means for selected features

Larvae (n = 45) Females (n = 18) Larvae (n = 2) Females (n = 5)
Width of opisthosoma 580 (488–756), SD 68 977(708–1122), SD 106 725 927
Width of podosoma at the level of legs III 560(439–732), SD 79
Width of podosoma at the level of legs IV 786(659–952), SD 63 891
Length of dorsal shield 1023 (976–1049), SD 24
Width of dorsal shield 497(464–537), SD 21
Total body length 1299 (1098–1586), SD 128 2996 (2391–3367), SD 223 1320 2818
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