The functional morphology of the branchial chambers and associated structures of Ebalia tuberosa (Crustacea: Decapoda: Leucosiidae), with special reference to ventilation of the egg‐mass

Abstract

Ebalia tuberosu bury themselves in sediment but do not construct permanent burrows. There are no functional Milne-Edwards' openings, the respiratory currents passing along channels formed by apposition of several interlocking buccal appendages. In adult females, the dome-like abdomen fits over the concave sternum to form a large abdominosternal chamber which completely encloses the egg-mass. The branchial chambers are connected to the abdominosternal chamber by two branchiosternal canals plugged by modified pericardial sacs which act as one-way valves. When the telson is extended, water is sucked into the abdominosternal chamber and then into the branchial chambers, thus ventilating the eggmass. The setation of the respiratory and associated structures serves to lock appendages together, to form screens and gaskets and to groom the buccal appendages. Setal morphology is shown to be correlated with function.

Grooming structure and function in some terrestrial Crustacea

“…Some pappose setae, particularly those of the lateral edges of the proximal propodus and distal ca4)us, did come in contact with the antennae and interorbital area during grooming, and Farmer (1974) has suggested that pappose setae function in the cleaning of adjacent mouthpart sffuctures. Nevertheless, pappose setae seem rather delicate and fragile in comparison to the typically robust and strongly serrate grooming setae of decapod crustaceans (Roberts 1968, Thomas 1910, Bauer 1915, Hindley & Alexander 1978, Schembri 1981, 1982a. Alternatively, Thomas (1970) has hypothesized a supporring role in food collection and transfer, and Schembri has proposed a mechanical function, as screens, gaskets, etc.…”

Modificações esqueletais e apendiculares torácicas para captação de água do solo em caranguejos semiterrestres (Crustacea: Brachyura: Grapsoidea:Ocypodoidea)

“…(Watling, 1989). Devido a sua onipresença e sua grande diversidade morfológica, são um tópico recorrente em trabalhos sobre os mais diferentes assuntos como taxonomia (Asakura & Watanabe, 2005), desenvolvimento larval (Pohle & Telford, 1981;Franzoso et al, 1998), morfologia e função de apêndices (Farmer, 1974;Factor, 1978;Holmquist, 1982;de Grave, 1999), alimentação (Stamhuis et al, 1998;Garm et al, 2003), comunicação (Strickler & Bal, 1973;Bauer & Caskey, 2006), ventilação da câmara branquial e massa de ovos (Schembri, 1981;Matsuoka & Suzuki, 2011), grooming (Bauer, 1981;Holmquist, 1989) ecologia trófica (Coelho & Rodrigues, 2001), locomoção (Hindley & Alexander, 1978;Hamilton, 1983) e reprodução (Antheunisse et al, 1968;Sankarankutty, 1968).…”

“…A tentativa pioneira de sistematizar esses conceitos for feita por Thomas (1970) A diversidade de morfotipos provavelmente está correlacionada com a grande variedade de funções (Garm, 2004b;Schembri, 1981). Dependendo da função exercida, alguns tipos de cerdas podem, inclusive, ocorrer em posições específicas de uma parte do corpo ou apêndice (Watling, 1989).…”

Συγκριτική μελέτη της βιολογίας και οικολογίας των καβουριών του γένους Portumnus Leach 1814

“…θξαμεο ησλ βξαγρίσλ (ηα νπνία βξίζθνληαη ζηε βξαγρηαθή θνηιφηεηα πνπ αλνίγεηαη ζην πεξηβάιινλ θνληά ζηηο βάζεηο ησλ πνδηψλ) απφ αησξνχκελα κεξίδηα(Schembri, 1981), αιιά θαη σο εζκνί δηήζεζεο ηνπ χδαηνο γηα ζπγθξάηεζε ησλ ηξνθηθψλ κεξηδίσλ, ηφηε ε κεγαιχηεξε αθζνλία ζκεξίγγσλ ζην κεζνπαξαιηαθφ P. lysianassa απφ εθείλε ζην ππνπαξαιηαθφ P. latipes, ζα κπνξνχζε λα ζεσξεζεί σο κηα πιενλεθηηθή πξνζαξκνγή ηνπ P. lysianassa ζην κεζνπαξαιηαθφ πεξηβάιινλ, ζην νπνίν νη ζπλέπεηεο ηεο θπκαηηθήο δξάζεο είλαη πνιχ πην έληνλεο. Δειαδή, ην πιενλέθηεκα είλαη φηη ην P. lysianassa ζα αληηκεησπίδεη κηθξφηεξν θίλδπλν απφθξαμεο ησλ βξαγρίσλ ηνπ θαη ζα κπνξεί λα δηεζεί κεγαιχηεξεο πνζφηεηεο χδαηνο, κε απνηέιεζκα ηε ζπγθξάηεζε πεξηζζφηεξσλ ηξνθηθψλ κεξηδίσλ.…”