Cylindrotomidae

long-bodied craneflies

Cylindrotomidae, commonly known as long-bodied craneflies, are a small of (: ) comprising approximately 65–71 extant in 9 and more than 16–20 extinct species. The family represents a classic 'ghost lineage' with no fossil record during the Mesozoic despite diversification of their sister family in the Cretaceous. Crown group diversification began in the Paleogene, with the oldest fossils dating to approximately 56 million years ago. The family is divided into two : Cylindrotominae, which are primarily Holarctic in distribution, and Stibadocerinae, which exhibit a Gondwanan distribution with genera restricted to Australia, Chile, and East Asia.

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Pronunciation

How to pronounce Cylindrotomidae: /sɪˌlɪndrəˈtɒmɪdiː/

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Identification

Distinguished from other (, , ) by the combination of large size (11–16 mm), yellowish to pale brownish coloration, and exceptionally elongated body proportions including long with 16 , elongated , legs, and . of Cylindrotominae are distinguished by numerous elongated cuticular lobes on the that create moss-like . Stibadocerinae can be distinguished from Cylindrotominae by characters, particularly the reduced .

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Habitat

are found in damp, wooded . occur in terrestrial, semiaquatic, and aquatic environments among mosses and herbaceous plants. Terrestrial moss-feeding tend to use specific groups of mosses belonging to Bryales or Hypnales. The Cylindrotoma is exceptional in that its larvae live on various flowering plants rather than mosses.

Distribution

Worldwide distribution with marked biogeographic disparity between . Cylindrotominae are primarily Holarctic, occurring in North America, Europe, and Asia including Japan, Russia (Arkhangelsk Oblast, Altai Republic, Amur Oblast, Novgorod Oblast, Magadan Oblast, Samara Oblast, Khabarovsk Krai, Kuril Islands), Belarus, Latvia, Finland, Germany, and Poland. Stibadocerinae exhibit a 'Gondwanan' distribution with restricted to Australia, Chile, and East Asia, representing vicariant South American-East Asian . Fossil records are concentrated in Baltic amber, the Green River Formation and Florissant Formation (USA), Fur Formation and Ølst Formation (Denmark), Kishenehn Formation (USA), Middle Salt Formation (France), Biamo Formation (Russia), and Bembridge Marls (UK).

Diet

are . Most feed on mosses (terrestrial, semiaquatic, and aquatic), with terrestrial showing specificity for Bryales or Hypnales. The Cylindrotoma is exceptional, with larvae feeding on various flowering plants. feeding habits are not explicitly documented.

Behavior

of Cylindrotominae exhibit remarkable resembling bryophytes (mosses), achieved through elongated cuticular outgrowths, green to brown body coloration, and patterns. Recent histological examination has revealed extensive internal musculature within the lateral cuticular lobes, indicating a locomotory function that challenges traditional interpretations of these structures as primarily respiratory or attachment devices. The represents a significant ghost lineage with no Mesozoic fossil record despite sister group diversification during the Cretaceous.

Similar Taxa

  • TipulidaeSister of ; distinguished by generally shorter body proportions, different , and much earlier diversification during the Cretaceous with extensive fossil record
  • LimoniidaeAnother ; typically smaller, more diverse, and with different larval preferences including more aquatic and semiaquatic environments
  • PediciidaeRelated ; distinguished by different patterns and generally more compact body form

More Details

Phylogenetic status

The taxonomic rank of Cylindrotomidae has been debated. While phylogenetic analyses by Petersen et al. (2010) did not support -level status, subsequent studies and catalogs have consistently treated the group as a family, and it remains an established family in current .

Ghost lineage significance

The Cylindrotomidae exemplify a classic ghost lineage—a group with no fossil record during a substantial period when closely related lineages were diversifying. This 100+ million year gap between the Jurassic divergence from and the first Paleogene fossils raises questions about fossilization biases and the of ancestral forms.

Biogeographic incongruence

The phylogenetic pattern within Cylindrotomidae shows apparent biogeographic incongruence: the most derived Stibadocerinae has a Gondwanan distribution, while the more inclusive Cylindrotominae are Holarctic. This pattern, combined with vicariant relationships between Chilean and East Asian , supports interpretations of an ancestral trans-Pacific .

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Sources and further reading