Entobdella squamula Johnston 1929
Creators: name: Kearn, Graham C.
name: Whittington, Ian D.
name: Evans-Gowing, Richard
Publisher: name: Zenodo
Year: 2007
Subjects: Biodiversity
Taxonomy
Animalia
Platyhelminthes
Monogenea
Capsalidea
Capsalidae
Entobdella
Entobdella squamula

description: Entobdella squamula (Heath, 1902) Johnston, 1929   
(Figs. 15E, 38)  
 [syn. Epidella squamula Heath, 1902; “ Epibdella squamata Heath ” of Guberlet (1936 /1937); Entobdella hippoglossi of Klassen et al. (1989)].   
 Type host and locality: Paralichthys californicus (Ayres, 1859), Monterey Bay, California, USA (Heath 1902) (Pleuronectiformes: Paralichthyidae).   
 Other hosts and localities: occasionally on Sebastodes spp. (see Heath 1902). See also Lawler (1981, table 77). Lawler does not include a reference by Margolis (1952) to “ E. squamula ” on the skin of Eopsetta jordani from Sydney Inlet, west coast of Vancouver Island. Guberlet (1936 /1937) reported “ Epibdella squamata Heath ” on “ Hyppoglossus hyppoglossus ” (sic), Paralichthys californicus and Sebastodes (species not named) ranging from Alaska to California. Lawler (1981) suggested that the records of Guberlet from Paralichthys and Sebastodes might be from Heath (1902).   
 Site on host: Skin, rarely gill cavity (Heath 1902).   
 Type series: The original description by Heath (1902) does not mention museum specimens. However, we borrowed a series of paratypes and voucher specimens from USNPC (a total of 10 specimens; see Table 2). In the series of slides with the USNPC No. 039579 (storage no. 213 - 12/17) 1 slide (storage No. 213 – 12) bears the name “ H. Heath ” but the series does not include a designated holotype. In our search for a holotype we approached the Hopkins Marine Station of Stanford University where Heath worked and the Pacific Grove Municipal Museum where he had contacts, but without success.   
 Specimens studied: 8 adult parasites from P. californicus (see Table 2).   
 Redescription (Fig. 38): Total length 7978 (4813 – 12528) (n = 8); body width 4266 (2888 – 7200) (n = 8); haptor length and breadth 2347 (1459 – 3008) (n = 7) and 2150 (1423 – 3038) (n = 8) respectively; accessory sclerite length 334 (268 – 384) (n = 13); anterior hamulus length 768 (596 – 938) (n = 13); posterior hamulus length 146 (113 – 182) (n = 11); pharynx length and breadth 565 (355 – 838) respectively (n = 9); testis length and breadth 713 (400 – 1414) and 787 (513 – 1143) respectively (n = 16). Heath (1902) gives a detailed description. However, our observations indicate that haptor papillae are not restricted to posterior two-thirds of ventral haptor surface (Fig. 38A). No lobed papillae found.   
 Differential diagnosis: Distinguished from E. hippoglossi and two new species described below by differences in mean ratio of lengths of anterior hamuli and accessory sclerites: 2.32 in E. squamula compared with <2 in other species (Table 3). Differs from E. brinkmanni n. sp., E. brattstroemi and E. soleae in shapes of accessory sclerites (cf. Figs. 15E, 38B with Fig. 15F, G, H, J). On skin of Paralichthys californicus [rarely gills (?); see Heath 1902].   
 Comments. Heath (1902) mentioned that Epidella (sic) (= Entobdella) squamula occurs “far less often upon various species of rock cod (Sebastodes)” but gives no more details.   
 The 2 specimens (USNPC 039581; see Table 2) collected from an undetermined host possibly from the Gulf of Mexico by E.E. Wehr and R. A. Coombs were regarded as E. squamula by Price (1939). However, confirmation of this must await identification and locality of the host and study of more specimens.
description: Published as part of Kearn, Graham C., Whittington, Ian D. & Evans-Gowing, Richard, 2007, A revision of Entobdella Blainville in Lamarck, 1818, with special emphasis on the nominal (type) species " Entobdella hippoglossi (Müller, 1776) Blainville, 1818 " (Monogenea: Capsalidae: Entobdellinae) from teleost flatfishes, with descriptions of three new species and a new genus, pp. 1-54 in Zootaxa 1659 on page 47