Cricotopus festivellus Kieffer 1906
Creators: name: Cuppen, Hub
name: Gresens, Susan E.
name: Tempelman, David
Publisher: name: Zenodo
Year: 2020
Subjects: Biodiversity
Taxonomy
Animalia
Arthropoda
Insecta
Diptera
Chironomidae
Cricotopus
Cricotopus festivellus

description: Cricotopus festivellus Kieffer, 1906:18
Cricotopus (Cricotopus) festivellus (Kieffer), Hirvenoja, 1973:225
Description of larval C. festivellus: based on 4 th instar larvae (n = 3). Measurements of bilaterally symmetric structures are reported as mean values per specimen. Head capsule width 334-344 µm (n = 2).
Head capsule yellow, sometimes proximal part light brown. Postoccipital margin dark brown. Bifid S1 setae with branches of similar size; S2 seta simple (Fig. 2A). Antennae 5 segmented, Lauterborn organs well-developed and extending 2/3 – 3/4 the length of antennal segment 3. Total antennal length 85 – 90 µm. Antennal blade extends to last segment, accessory blade half that length. Antennal ratio 1.9-2.1, mean 2.0 (n = 3). Pecten epipharyngis composed of 3 scales. Mandible and 3 inner teeth, brown extending to molar area with wide pale base (Fig. 2A), length 136 µm. Outer margin of mandible smooth. Seta subdentalis yellow, ca. 2 times long as wide with a notched asymmetric tip which reaches the last free mandible tooth. Seta interna with 6 branches. Premandibula simple. Galea of maxilla with two or three rows of pectinate lamellae.
Mentum with 6 brown lateral teeth; median tooth projecting forward and at most 3 times wider than first lateral tooth; MR (width of median tooth/ width first lateral tooth ranges from 2.7-3.0, mean 2.85 (n = 3). VM-plate reaches1 st lateral tooth. Submental setae located at the level of the fourth lateral tooth of the mentum.
Middle-sized claws of the anterior parapods with inner teeth at most half as long as apical tooth (Fig. 6B). Abdominal segments 1 - 6 bear posterolateral setal tufts of 12-24 filaments. Length of tufts from 70 – 240 µm, reaching up to half to ¾ the length of the segment. Setal tufts on segment VII bear 8-10 setae which are shorter than the setae on I - VI. (Fig. 3).
Procercus wider than long, bearing a sclerotized scale and 5-6 apical setae plus 2 fine lateral setae. Supra-anal setae 78 – 83 µm, as long or slightly longer as the anal tubules.
Pupa: The pupa of Cricotopus festivellus is described by Hirvenoja (1973) and Langton (1991). Exuviae light brown, characterized by frontal setae located on prefrons, 4 lateral setae on segment VIII with L4 not larger than the other lateral setae. Thoracic horn distally pointed and covered with small spinules. Pedes spurii B obvious on segment II but absent or weak on III. Tergite II usually with an extensive area of small spinules, variable, but at always at least bearing a transverse band of spinules anterior to the hooklet row. Tergites III-VI with median and posterior transverse bands of small points separated, but usually joined laterally, leaving a conspicuous median bare patch in the region of the posterior muscle marks.
Specimens examined: NTNU University Museum: 200820 (NO56), 200824 (NO60), 200826 (NO63), 200831 (NO73); H. Cuppen personal collection: 3 larvae, one with associated pex, 1 pex (Table 1).
DNA barcodes (BOLD Process IDs): BSCHI522-17, BSCHI708-17, BSCHI731-17, CHRFI512-11, CHRFI729-11, CHRSV514-11, CHRSV515-11, CHRSV517-11 = NO56, CHRSV521-11 = NO60, CHRSV524-11 = NO63, NEACH003-12 = NO73.
description: Published as part of Cuppen, Hub, Gresens, Susan E. & Tempelman, David, 2020, DESCRIPTION OF THE LARVAE OF CRICOTOPUS FESTIVELLUS (KIEFFER 1906) AND CRICOTOPUS DIVERSUS (BOESEL 1983) WITH KEYS TO DISCRIMINATION OF LARVAL, PUPAL AND ADULT STAGES (DIPTERA: CHIRONOMIDAE) Abstract, pp. 4-16 in CHIRONOMUS Journal of Chironomidae Research 33 (33) on pages 6-7, DOI: 10.5324/cjcr.v0i33.2985, http://zenodo.org/record/7987395