A redescription of Dolops ranarum (Stuhlmann, 1891) (Crustacea: Branchiura)

“…It may be a homologue of the evertible preoral spine of Argulus, which is used by recent branchiurans to penetrate the host body integument (Gresty et al, 1993). Paired gonads of branchiurans are located laterally on the abdomen, and may penetrate into the furcal lobes (Avenant et al, 1989), resembling the proposed interpretation of tubular structures associated with the intestine in Halicyne.…”

Section: Evolutionary Relationships Of the Cycloidsmentioning

confidence: 91%

“…Its first maxilla bears hooks used to grasp the host skin and anchor to it (Avenant et al, 1989), instead of being transformed into suckers typical of other branchiurans. Another unique character of this branchiuran is the sperm transfer that involves the employment of spermatophores.…”

Section: Evolutionary Relationships Of the Cycloidsmentioning

confidence: 99%

Gill structure and relationships of the Triassic cycloid crustaceans

Dzik

2008

Journal of Morphology

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Unusually well-preserved fossils of a Halicyne-like cycloid crustacean frequently occur in the early Late Triassic lacustrine clay bed at Krasiejów in Opole Silesia, southern Poland. Its gill-like structures form a horseshoe-shaped pair of units composed of numerous calcified blades with reverse U-shaped cross-section. Originally, these were parallel slits opening on the ventral surface of the carapace. Lobation of the posterior margin of the carapace, of unusually large mature size for the group, make the animal different from other members of Halicynidae, and the new name Opolanka decorosa gen. et sp. nov. is proposed for it. More completely preserved specimens of cycloids from Vosges, France, and Madagascar show that the slit openings were located above radially arranged coxae of the walking appendages and a reduced abdomen. The disposition and arrangement of the cycloid gills suggest at least close analogy, and possibly homology, with the "respiratory areas" of the Branchiura, serving mostly as ion-exchange organs. It is proposed that they originated, in connection with the body size increase and adaptation to fresh-water environment, as radially arranged infoldings of the respiratory areas cuticle, with strongly calcified rigid dorsal parts suspended from the carapace. At least three ecologically and anatomically distinct lineages were represented in the order Cyclida, which was probably initially confined to marine environments and gradually adapted to life in continental waters. New taxa Schraminidae fam. nov. (with Schramine gen. nov.) and Americlidae fam. nov. (with Americlus gen. nov.) are proposed.

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“…Parasite collections were done according to Paperna (1996) and identified according to Ergens (1971), Kritsky & Kulo (1988) and Khalil & Mashego (1998) digeneans; Anderson (1992) for nematodes; Kuchta et al (2008) and Scholz et al (2009) for cestodes;Marx & Avenant-Oldewage (1996) for the copepod; Avenant-Oldewage & Knight (1994) and Avenant et al (1989) for branchiurans. The ecological terminology used is that recommended by Bush et al (1997).…”

Section: Methodsmentioning

confidence: 99%