. Bonner zoologische Monographien. Zoology. 67. B : Suspensorium and preopercle of Eutropiichthys vacha (109 mm standard length; KU 12169). — A: Lateral view; arrow points to the autopalatine-metapterygoid ligament; B: Lateral toothplate, ventral view. Scale applies to both figures. aoh: membranous outgrowth; apa: autopalatine; : exit foramen of the facial nerve; Ent3: 'entopterygoid' type 3; : foramen for the passage of facial nerve; hy: hyomandibula; mtg: metapterygoid; Pop: preopercle; : processus anterodorsalis; : proccesus levator opercuH; q: quadrate; Tp: lateral t
. Bonner zoologische Monographien. Zoology. 67. B : Suspensorium and preopercle of Eutropiichthys vacha (109 mm standard length; KU 12169). — A: Lateral view; arrow points to the autopalatine-metapterygoid ligament; B: Lateral toothplate, ventral view. Scale applies to both figures. aoh: membranous outgrowth; apa: autopalatine; : exit foramen of the facial nerve; Ent3: 'entopterygoid' type 3; : foramen for the passage of facial nerve; hy: hyomandibula; mtg: metapterygoid; Pop: preopercle; : processus anterodorsalis; : proccesus levator opercuH; q: quadrate; Tp: lateral toothplate; ?: additional pterygoid? The autopalatine is a small rod-like bone, that has cartilage both anteriorly and posteriorly. The small maxilla articulates through two small facets with the anterior autopalatinal cartilage. The anterior cartilage also rests on the posterior margin of the premaxilla. In Ailia coilia the autopalatine articulates with both the maxilla and the antorbital. In Eutropiichthys, the antorbital articulates with the lateral ethmoid (but not the maxilla) and is attached by ligaments to the autopalatine, premaxilla, and to the base of the nasal barbel. Anteriorly, the metapterygoid produces two small projections. An 'entopterygoid' type 3 is located between the projections. The large metapterygoid is laterally sutured to the lateral tooth plate, and posterodorsally sutured to the hyomandibula and quadrate. In addition, a synchondral articulation is present between the lateral part of the meta- pterygoid and the pterygoid process of the quadrate. In the specimen studied here, there is an additional small, flat bone present. It is medial to the metapterygoid and was not mentioned by Tilak (1961), and its presence is pro- bably variable. This bone is free; I could detect no ligamentous, or other connection joining it to any surrounding bones. The quadrate is a large bone, almost rectangular; with an elongate chondral pterygoid process that dorsally bear
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Keywords: ., bookcentury1900, bookcollectionbiodiversity, booksubjectzoology
