File:Bulletin (1971-) (19802522333).jpg

Title: Bulletin
Identifier: bulletin7073sout (find matches)
Year: 1971- (1970s)
Authors: Southern California Academy of Sciences
Subjects: Science; Natural history; Natural history
Publisher: Los Angeles, Calif. : The Academy
Contributing Library: New York Botanical Garden, LuEsther T. Mertz Library
Digitizing Sponsor: The LuEsther T Mertz Library, the New York Botanical Garden

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1974 HOI') l PARASITES AND NEW SPE( IES FROM < \LIFORl I I separated from ihc pereon, and the pleon markedly narrower than the hist pereomere, roughly triangu- lar and ending in a rounded point. I he immature female of S. hyptius can be distinguished by its hick of coxal plates, its elongate pleomeres and very prominent uropods. Two of the host Pagurus annulipes, in addition lo bearing mature pairs of Stegophryxus hyptius on the abdomen, also bore cryptoniscan larvae on the thorax. On one /'. annulipes there were two cryptoniscans, one attached to the carapace, the other to a pereopod; on the other P. annulipes, three cryptoniscans were clinging lo the carapace and a fourth was inside the branchial chamber, These larvae, one of which is pictured (Figs. 3B-F), agree in all respects with those which Thompson (1902) described, even though he found them with the nude in the brood chamber of the female Stegophryxus rather than on the host's body. I have sent some of these larvae to Jarl-Ove Stromberg of the University of Lund, who plans to examine them with a scanning electron microscope. One pair of Stegophryxus hyptius from Pagurus bonairensis was examined while still alive. The female was clinging so lightly to its host's pleopods that one pleopod was torn off in removing the parasite. Its only movement was a constant beat- ing of the anterior oostegites to aerate the larvae filling the closed brood pouch. The male, rather than being in the female's brood pouch, as is typical, was crawling all over its body. The color of the female was transparent to whitish except that dorsally the gut was red-orange and the ovaries yellowish with developing eggs, and there were a few chalky white chromatophores scattered along the sides. The male was transparent except for black eyespots, a brownish gut and a network of interconnecting white lines in all pereomeres and the posterior third of the pleon. A second pair was examined freshly preserved. The female had a uniform glossy white background with brick- red eyes, a pale yellow central dorsal region on the pereon and a few chalky white chromatophores scattered near the edges of the pereon; develop- ing embryos visible through the oostegites bore rows of punctate red chromatophores. The ac- companying male was also glossy white with black eyespots. an orange gut and scattered black and white chromatophores. Previous records of 5. hyptius are only from Rhode Island and Woods Hole. Massachusetts. At the latter locality it is so common that Reinhard (19491 used it in a classical study to demonstrate se\ dcten alion in Ihi Bi p ridac, and R< it til.. (1947 ) madi the effects il had on its host, which u Pagurui longicarpus I he new record', thu a considerable i tension of ra em Florida, and several new host r species ol Pagurus. <)l the parasites examined, 17 were still with their hosts. Five ol these hosts were males. 12 females, the females being hosts significant!) more often. Stegophryxus thompsoni Nierstrasz and Brender £ Brandis 1931 Figures 4—5 Stegophrixus thompsoni Nierstrasz and Brender a Brandis, 1931, pp. 196-198, figs. X7-89. Material examined.—From unknown hermit crab. Valparaiso. Chile, exact locality and date unknown. I h. Mortensen Pacific Expedition, coll. Holotyi allotype i. both damaged, ZM< Redescription ) holotypic female (Fig. 4).— Body length 8.0mm, maximal body uidth 3.7mm. head length 1.6mm, pleon length 3.8mm, distortion of body axis 50 degrees. Body badly damaged, so out- line uncertain (Fig. 4A1. Head twice as long as wide. Segmentation of antenna 1 uncertain, antenna 2 (Fig. 4B; of five
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Figure 4. Stegophryxus thompsoni Nierstrasz and Brender a Brandis. holotype female. A. Dorsal view. B. Right antenna 2. C. Right maxilliped. D. Right posterior ventral border of head. E. Right oostegite 1. interior. F. Same, exterior. G. Left pereopod 2. H. Right pereopod 6. I. Pleon. ventral \ iew v indicates 1.0mm for A. C. E. F, I. 0.4mm for B. 0.25mm for D. 0.5mm for G, H.

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